Core catcher



Nov. 29, 1932.- R, PER 1,889,277

CORE GATGHER Filed March 23, 1952 2 Sheets-Sheet 1 1?, fJra wr Inventor I R. J. DRAPER CORE CATCHER Nov. 29, 1932 Filed March 25, 1932 Y 2 Sheets-Sheet 2 lnvenlbr E, ffiz u aar Patented Nov. 29, 1932- UNITED STATES RAYMOND J. DRAIPER, 03' LOS ANGELES, CALIFORNIA CORE CATGEER Application filed March 23,

This invention appertains to new and use ful improvements in means for retaining cores or samples such as are taken from drilled wells, which ordinarily supplies information on which the log of the well'is based. v I v The principal object of this invention is' to provide a fool-proofpositive-acting device .for catching and retaining cores so that the two cross sections of the earth strata can be ascertained, thus eliminating jumbling and distortion of thecore as well as efficient break, ing of the core from the well.

Other important objects and advantages of the invention will become, a arent to the reader of the following speclhcation.

In the drawings z-- v Figure 1 represents a side elevational view of the catcher device.

Fig. 2 represents a top plan view of the device. v

Fig. 3 represents a vertical sectional view through the catcher.

Fig. 4 represents a side elevational view,- of the catcher bushing. I

Fig. 5 represents a side elevational view of one of the pawls.

Referring to the drawings wherein like numerals designate like parts, it can be seen 3@ that numeral 5 represents a cylindrical sleeve,

within which the bushing 6 snugly fits.

As is clearly shown in Fig. 1, the sleeve 5 is provided with a plurality 01' short upwardly extending openings 7 extending upwardly from the lower end of the sleeve, while reg istering with these openings '2 are the elongated longitudinally extending slots in the ushing 6.

Extending upwardly on the outside of the hashing 6 from each of the slots 8 is a groove for receiving the upper end portion of the .corresponding leaf spring 9, there being one for each of the slots 8.

The upper end portion of each of these springs are secured to the bushing 6 by a screw 10 while its lower end portion is normally curved inwardly as shown in Fig. 3, so to exert tension against the pivotal pawls 11, there being one for each of the slots 8. As is clearly shown in Fig. 4, the bushing 1932.- Serial rm.v 600,804.

6 is provided with a circuniferentiallyextendng groove 12, in which the split spring rin 13 is trained and this tie member is dispose through transvorsel extending bores 14: in the pawls 11, whereh moving inwardly to engage a'core 15.

The but-t end 16 ofthe pawls 11 are operative in the opening 7 of the sleeve 5. The inner-"ends of the awls 11 areprovided with teeth 17 for gripping the core 15.

' Obviously, the core 15 can ride upwardly through the center device, but due to the tension of the s ring 19 a ainst the pawls 11, the pawls wi I prevent t e core from riding back into the well.

While the foregoing specification sets forth the invention in spec1fic terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invcntion as claimed hereinafter.

Having thus described my invention, what I claim as new is 1. A core catcher comprising a cylindrical member through which a core can move, inwardly urged pawls on the cylindrical member for engaging the core to prevent return motion thereof, a snugly fitting sleeve on the cylindrical member, and leaf springs interposed between the cylindrical member and the sleeve, and having free end portions for engaging the pawls to urge the same inwardly.

2. A. core catcher comprising a cylindrical member having slots therein, said cylindrical member being provided with a circumferem tially extending external groove, a tie member extending in the said groove pivotal core engaging members each provided with an opening through which the said tie member extends, said core engaging members hein operative in the slots, leaf'springs secureo.

to the outside of the cylindrical member and being adapted to bear against the core engaging members to urge the same inwardly toward each other, a sleeve for snug engagement over the said cylindrical member and against the said leai spring and provided with slots registering with the aforemeny the pawls are swing- .5 v ably mounted in the slots 8 and capable of tioned slots to accommodate the said core engaging members.

3. A core catcher comprising a cylindrical member having slots therein, said cylindrical member bein' provided with a circumferentially extending external groove, a tie member extending in the said groove pivotal core engaging members each provided with an opening through which the saidtie member extends, said core engaging members being operative in the slots, leaf s rings se- I cured to the outside of the cylindrical member and being ada ted to bear against the core engaging memers to urge the same inwardly toward each other, a sleeve for snug engagement over the said cylindrical member and against the said leaf spring and'provided with slots registering withthe aforementioned slots to accommodate the said core engaging members, said slots in the sleeve terminating adjacent the core.engag- I mg members to form abutments against which the core engaging members can be sto ped.- v- '7 n testimony whereof I aflix my signature.v RAYMOND J. DRAPER. 

